Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 33,028	$ 2,546	$ 34,595	$ 2,293
Total other comprehensive loss	(170)	(186)	(623)	(312)
Balance at end of period	32,429	33,760	32,429	33,760
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(644)	(193)	(180)	(67)
Other comprehensive income (loss) before reclassifications	(191)	(190)	(663)	(318)
Amounts reclassified from accumulated other comprehensive loss	4	4	12	6
Total other comprehensive loss	(187)	(186)	(651)	(312)
Balance at end of period	(831)	(379)	(831)	(379)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(138)	(144)	(141)	(16)
Other comprehensive income (loss) before reclassifications	6	(4)	1	(134)
Amounts reclassified from accumulated other comprehensive loss	4	4	12	6
Total other comprehensive loss	10	0	13	(128)
Balance at end of period	(128)	(144)	(128)	(144)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(500)	(47)	(33)	(49)
Other comprehensive income (loss) before reclassifications	(197)	(186)	(664)	(184)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive loss	(197)	(186)	(664)	(184)
Balance at end of period	(697)	(233)	(697)	(233)
Pension Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(6)	(2)	(6)	(2)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive loss	0	0	0	0
Balance at end of period	$ (6)	$ (2)	$ (6)	$ (2)